摘要
以尼龙短纤维(NSF)增强天然橡胶(NR)混炼胶为研究体系,以马来酸酐接枝天然橡胶(MNR)为增容剂,考察增容剂、NSF含量对NR/NSF母胶动态流变行为的影响;将NR/NSF母胶加入30份白炭黑(Si O2)填充NR混炼胶中,对比研究NR/NSF、NR/NSF/Si O2混炼胶的线性与非线性流变行为及动态力学行为,采用修正的两相模型分析"粒子相"的增强作用,探讨硫化胶储能模量E'和损耗因子tanδ的变化.结果表明,MNR影响NSF在基体中的分散性和NSF/NR混炼胶的动态流变行为;高填充Si O2和少量NSF之间存在协同增强作用,使NR/NSF/Si O2混炼胶的补强因子和应变放大因子均高于NR/NSF混炼胶,显著增加"粒子相"的黏性与弹性贡献,限制"粒子相"的松弛;硫化胶的E'和tanδ峰值随NSF体积分数增加分别升高和降低.
Nylon short fiber （NSF） and silica were used to fill natural rubber （NR） to prepare composites compatibilized by maleated natural rubber （MNR）. Influences of NSF content on dynamic rheological behavior were discussed for the un-compatibilized and the MNR compatibilized NSF/NR compounds. The compatihilized NSF/NR masterbatch was added into NR filled with 30 phr silica, and dynamic rheological behavior of the compounds was investigated with respect to NSF content. The modified two phase model was used to analyze the enhancement effect of ＂filler phase＂ constructed by introducing NSF or by introducing both NSF and silica. The changes of storage modulus E＇ and loss factor tanδ of vulcanites were studied for clarifying influence of composition on dynamic mechanical behavior. It was indicated that MNR could efficiently enhance the compatibility between NSF and rubber matrix to improve the dispersion of fiber and to construct a strong ＂filler phase＂ in comparison with that in the un-compatihilized compounds. Introduction of silica greatly improves both the elastic and the viscos contributions of the ＂ filler phase＂ with a markedly reduced relaxation dynamics,the reinforcing factor and strain amplification factor of NR/NSF/SiO2 compounds were higher than those of NR/NSF compounds. Storage modulus and peak value of loss factor increased and decreased, respectively,with adding of NSF in the NR vulcanites.
出处
《高分子学报》
SCIE
CAS
CSCD
北大核心
2015年第5期542-549,共8页
Acta Polymerica Sinica
基金
国家自然科学基金(基金号51373149)
国家自然科学基金重点基金(基金号51333004)
贵州省科技厅2013年度重大专项计划项目(项目号黔科合重大专项字(2013)6016号)资助
关键词
天然胶
增强
流变行为
两相模型
Natural rubber, Reinforcement, Rheology, Two phase model
